scholarly journals High-Transmittance 2π Electrically Tunable Terahertz Phase Shifter with CMOS-Compatible Driving Voltage Enabled by Liquid Crystals

2019 ◽  
Vol 9 (2) ◽  
pp. 271 ◽  
Author(s):  
Chan-Shan Yang ◽  
Chun Kuo ◽  
Po-Han Chen ◽  
Wei-Ta Wu ◽  
Ru-Pin Pan ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Phase Shifter ◽  
Quartz Substrate ◽  
Phase Shifters ◽  
Driving Voltage ◽  
Cmos Compatible ◽  
Pretilt Angles ◽  
Good Agreement

We have investigated tunable terahertz (THz) phase shifters that are based on a sandwiched liquid crystal (LC) cell with indium–tin–oxide (ITO) nanowhiskers (NWhs) as transparent electrodes. More than 360° of phase shift at 1.0 THz was achieved at a driving voltage as low as ~2.6 V (rms). This is approximately 40 times smaller than that reported in previous works using an electrically tuned LC device. Significance of the NWhs in reducing the required voltage is demonstrated. Overall transmittance of the device is as high as 30%, which is accountable by absorption losses of ITO NWhs, quartz substrate and LC. Experimental results are in good agreement with a theoretical formulism while taking into account super-thick LC cells (~1 mm) and pretilt angles. We also propose and demonstrate a novel THz technique for measuring pretilt angles of liquid crystals.

Ultrathin films of homeotropically aligned columnar liquid crystals on indium tin oxide electrodes

2008 ◽  
Vol 92 (2) ◽  
pp. 024107 ◽  
Author(s):  
E. Charlet ◽  
E. Grelet ◽  
P. Brettes ◽  
H. Bock ◽  
H. Saadaoui ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Ultrathin Films ◽  
Oxide Electrodes

scholarly journals Optically Transparent Metasurface Absorber Based on Reconfigurable and Flexible Indium Tin Oxide Film

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1032
Author(s):  
Lei Chen ◽  
Ying Ruan ◽  
Si Si Luo ◽  
Fu Ju Ye ◽  
Hao Yang Cui
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Air Permeability ◽  
Ultra Wideband ◽  
Reflection Coefficients ◽  
Transmission And Reflection Coefficients ◽  
Ito Film ◽  
Optically Transparent ◽  
Transmission And Reflection ◽  
Good Agreement

In this paper, we present a flexible, breathable and optically transparent metasurface with ultra-wideband absorption. The designed double layer of indium tin oxide (ITO) films with specific carved structure realizes absorption and electromagnetic (EM) isolation in dual-polarization, as well as good air permeability. Under the illumination of x- and y-polarization incidence, the metasurface has low reflectivity and transmission from about 2 to 18 GHz. By employing ITO film based on polyethylene terephthalate (PET), the presented metasurface also processes the excellent flexibility and optically transparency, which can be utilized for wearable device application. In addition, the dual-layer design enables mechanically-reconfigurable property of the metasurface. The transmission and reflection coefficients in two polarizations show distinct difference when arranging the different relevant positions of two layers of the metasurface. A sample with 14*14 elements is designed, fabricated and measured, showing good agreement with the simulation results. We envision this work has various potentials in the wearable costume which demands both EM absorption and isolation.

Liquid crystal terahertz phase shifters with functional indium-tin-oxide nanostructures for biasing and alignment

2014 ◽  
Vol 104 (14) ◽  
pp. 141106 ◽  
Author(s):  
Chan-Shan Yang ◽  
Tsung-Ta Tang ◽  
Ru-Pin Pan ◽  
Peichen Yu ◽  
Ci-Ling Pan
Keyword(s):  
Liquid Crystal ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Phase Shifters ◽  
Oxide Nanostructures
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